<template>
  <el-container>
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt />
        <span>后台管理系统</span>
      </div>
      <el-button type="primary" @click="logout">退出</el-button>
    </el-header>
    <el-container>
      <!-- 侧边栏区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
          <div class="togleBtn" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区域 -->
        <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409EFF"
      :collapse="isCollapse"
       :collapse-transition="false"
        router
        :default-active="isActive">
      <!-- 一级菜单 -->
      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
        <template slot="title">
          <i :class="iconObj[item.id]"></i>
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
          <el-menu-item :index="'/' + subItem.path"  v-for="subItem in item.children" :key="subItem.id" @click="saveActivePath('/' + subItem.path)">
              <i class="el-icon-menu" ></i>
              <span>{{subItem.authName}}</span>
          </el-menu-item>
      </el-submenu>
    </el-menu>
      </el-aside>
      <!-- 主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  created () {
    this.getMenuList()
    this.isActive = window.sessionStorage.getItem('activePath')
  },
  data () {
    return {
        menulist: [],
        iconObj: {
            '125': 'iconfont icon-user',
            '103': 'iconfont icon-tijikongjian',
            '101': 'iconfont icon-shangpin',
            '102': 'iconfont icon-danju',
            '145': 'iconfont icon-baobiao'
        },
        // 默认菜单不折叠
        isCollapse: false,
        isActive: ''
    }
  },
  methods: {
    logout () {
      // 删除token 并跳转到login
      sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
        const { data: res } = await this.$http.get(`menus`)
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
    },
    // 点击菜单折叠或展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    saveActivePath (activepath) {
        window.sessionStorage.setItem('activePath', activepath)
        this.isActive = activepath
    }
  }
}
</script>

<style lang="less" scoped>
.el-container {
  height: 100%;
  .el-header {
    display: flex;
    justify-content: space-between;
    background-color: #373d41;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      > span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
  }
  .el-main {
    background-color: #eaedf1;
  }
  .iconfont {
      margin-right: 10px;
  }
  .togleBtn{
    background-color: #4a5064;
    font-size: 10px;
    color: #fff;
    letter-spacing: 0.2em;    text-align: center;
    line-height: 24px;
    cursor: pointer;
  }
}
</style>